defenestration (English)

Where does "defenestration" come from?

The English noun 'defenestration' originates from the New Latin 'defenestratio'[1]. This term is composed of the prefix 'dē' meaning 'out of' or 'down from'[2], the noun 'fenestra' meaning 'window'[1], and the suffix '-ātiō' which denotes an action or process[2]. While the root 'fenestra' likely traces back to Etruscan forms such as '*fnestra'[3], the Latin preposition 'dē' has deeper roots in Proto-Italic and Proto-Indo-European[4]. Though the noun provided the basis for the term, the verb 'defenestrate' was actually formed at a later time[1].

Open questions

• The derivation of the Latin 'fenestra' from Etruscan forms is based on limited evidence. [3]
• The reconstructed Proto-Indo-European form '*déh₁' is a linguistic hypothesis. [4]

Full etymology tree

• defenestration (English), 'The act of throwing something or especially someone out of a window, especially lethally.'
  • derived defenestratio (Latin), 'The act of throwing something or someone out of a window.'
    • compound de- (Latin), 'of; from'
      • inherited de (Latin), 'of; concerning; about'
        • inherited *dē (Proto-Italic)
          • inherited *déh₁ (Proto-Indo-European), 'toward'
            • compound *de (Proto-Indo-European), 'to, towards'
            • suffix *-h₁ (Proto-Indo-European), 'Adverbial suffix with instrumental meaning'
    • compound fenestra (Latin), 'a window, an opening for light'
      • borrowed 𐌚𐌍𐌄𐌔𐌕𐌓𐌀 (fnestra) (Etruscan)
    • suffix -atio (Latin), 'Form of -tiō appended to nouns'

Ancestors

• defenestratio (Latin)

Cognates and doublets

• défenestrer (French)
• Fenstersturz (German)
• defenestrazione (Italian)

Sources

1. defenestration (English) - Wiktionary
2. defenestratio (Latin) - Wiktionary
3. fenestra (Latin) - Wiktionary
4. de (Latin) - Wiktionary

Updated August 2026

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Etymology data from Wiktionary, CC BY-SA 4.0 · About Miraris